Gearbox gear shifting structure of agricultural machine

Abstract

The utility model discloses a gear shifting structure of an agricultural machinery gearbox, which relates to the technical field of clutch gear shifting mechanisms, and effectively reduces the abrasion of a shifting fork and prolongs the service life of the gear shifting mechanism by converting the impact or sliding friction between the shifting fork and a speed changing shaft sleeve into rolling friction. According to the scheme, the gearbox specifically comprises a gearbox shell, a mounting shaft is rotationally connected into the gearbox shell, a speed change shaft sleeve is connected to the mounting shaft through a spline, and a gear shifting assembly is arranged on the gearbox shell; the gear shifting assembly comprises a mounting rod, and the mounting rod is rotationally connected to the gearbox shell. A gear shifting arm is arranged at the end, on the outer side of the gearbox shell, of the installation rod, the other end of the installation rod is rotationally connected with a shifting wheel, and the shifting wheel is used for driving the speed change shaft sleeve to move in the axial direction of the installation shaft.

Description

Technical Field

[0001] This utility model relates to the technical field of clutch shifting mechanisms, specifically to a shifting structure for an agricultural machinery gearbox. Background Technology

[0002] A transmission, also known as a gearbox, is a mechanism used to change the speed and torque from an engine. It can change the transmission ratio between the output shaft and the input shaft in a fixed or progressively increasing manner. A transmission consists of a gear-shifting mechanism and a control mechanism; some cars also have a power take-off (PTO) mechanism. Most transmission mechanisms use ordinary gear drives, while some use planetary gear drives. Ordinary gear drive transmission mechanisms typically use sliding gears and synchronizers, among others.

[0003] In agricultural machinery and equipment, such as mini tillers, gearboxes are also widely used. In mini tillers, due to their fewer gears and simpler structure, such as the gearbox of a rotary tiller disclosed in utility model application number CN202223073050.1, the shift fork can drive the engagement sleeve to move in the direction of engagement tooth one or engagement tooth two so that the engagement sleeve meshes with it, thereby realizing speed change.

[0004] However, during actual transmission, the engagement sleeve rotates along with the shaft, and when the shift fork comes into contact with the rotating engagement sleeve, impact and sliding friction occur, which causes wear on the shift fork and affects its performance. Utility Model Content

[0005] I. Technical problems to be solved

[0006] This invention addresses the shortcomings of existing technologies by proposing a shifting structure for agricultural machinery gearboxes. It transforms the impact or sliding friction between the shift fork and the gearbox sleeve into rolling friction, effectively reducing shift fork wear and extending the service life of the shifting mechanism.

[0007] II. Specific Technical Solutions

[0008] A shifting structure for an agricultural machinery gearbox includes a gearbox housing. A mounting shaft is rotatably connected within the gearbox housing, and a shift sleeve is connected to the mounting shaft via a spline. A shifting assembly is provided on the gearbox housing. The shifting assembly includes a mounting rod rotatably connected to the gearbox housing. A shift arm is provided at one end of the mounting rod on the outside of the gearbox housing, and a shift wheel is rotatably connected to the other end of the mounting rod. The shift wheel is used to drive the shift sleeve to move axially along the mounting shaft.

[0009] Implementation principle and working principle:

[0010] In this design, the mounting shaft can serve as either an output or input shaft. When shifting gears, the gearbox on the mounting shaft engages with corresponding gears on other shafts via the shifting assembly, creating different transmission ratios and achieving gear shifting. During actual gear shifting, the rotation of the shift arm causes the shift wheel at the other end of the mounting rod to contact the gearbox, pushing it to slide. When the shift wheel contacts the gearbox, the rotation of the gearbox causes the shift wheel to rotate, effectively reducing wear on both the gearbox and the shift wheel and extending the service life of the shifting mechanism.

[0011] Preferably, the gear shift sleeve is provided with an annular receiving groove, and the actuating wheel is located in the annular receiving groove. When the gear shift sleeve is moved by the actuating wheel, the actuating wheel abuts against either side of the two side walls of the annular receiving groove in the axial direction. The beneficial effect of this preferred embodiment is that the setting of the annular receiving groove provides sufficient contact surface between the gear shift sleeve and the actuating wheel, ensuring successful gear shifting.

[0012] Preferably, a rod sleeve is provided on the gearbox housing, and the mounting rod is rotatably connected to the gearbox housing through the rod sleeve; a sealing ring is also provided between the mounting rod and the rod sleeve, and an oil seal is also provided at the end of the rod sleeve near the shift arm; the beneficial effect of this preferred embodiment is that, by providing the sealing ring and the oil seal, the lubricating oil located in the rod sleeve can be prevented from flowing out, affecting the smoothness of the mounting rod rotation and reducing wear.

[0013] Preferably, the shift arm further includes a cover plate, which is disposed at one end of the mounting rod located outside the gearbox housing. The upper end of the cover plate is provided with the shift arm. The cover plate is fixedly disposed at the end of the mounting rod by bolts, and a washer is also provided at the connection between the bolts and the mounting rod. The advantages of this preferred embodiment are that, by providing a cover plate, it can achieve a good dustproof effect, and, by connecting the shift arm through the cover plate, different shift arms can be selected according to actual needs, thus improving versatility.

[0014] Preferably, the mounting rod has a connecting plate at one end inside the gearbox housing, and a mounting post is provided at the free end of the connecting plate, with the actuating wheel rotatably connected to the mounting post. The advantage of this preferred embodiment is that the installation of the actuating wheel is more convenient through the provision of the connecting plate and the mounting post.

[0015] Preferably, the free end of the mounting post is detachably provided with an anti-detachment limiting component, which is used to prevent the actuating wheel from falling off. The beneficial effect of this preferred embodiment is that by setting the anti-detachment limiting component, the actuating wheel can be prevented from sliding off along the axial direction of the mounting post. The anti-detachment limiting component is installed by means of a threaded connection, which is simple, convenient and easy to operate.

[0016] Preferably, the mounting shaft has a mounting hole in the radial direction, and a limit spring is provided in the mounting hole. A limit ball is fixedly provided on one side of the outer surface of the mounting shaft by the limit spring. When not in a limiting position, the side of the limit ball away from the spring protrudes from the outer surface of the mounting shaft. The beneficial effect of this preferred embodiment is that when the gear sleeve passes through the limit ball, the limit ball will exert pressure on the gear sleeve, thereby limiting the gear sleeve and helping to maintain stable gear connection.

[0017] Preferably, a plurality of annular grooves are provided on the inner surface along the axial direction of the transmission bushing, and the annular grooves cooperate with the limiting ball; the beneficial effect of this preferred option is that the setting of the annular grooves can further ensure that the limiting ball is in the annular grooves, and ensure that it can run smoothly in the predetermined gear.

[0018] The beneficial effects of this utility model are as follows:

[0019] The beneficial effects of this solution are that, during gear shifting, the rotation of the shift arm causes the shift wheel at the other end of the mounting rod to abut against the gear shift sleeve, thereby pushing the gear shift sleeve to slide. When the shift wheel contacts the gear shift sleeve, the rotation of the gear shift sleeve will drive the shift wheel to rotate, which can effectively reduce the wear of the gear shift sleeve and the shift wheel, and can effectively extend the service life of the shifting mechanism. Through the cooperation of the limit spring, the limit ball and the annular groove, the axial positioning of the gear shift sleeve can be achieved, ensuring gear stability. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall assembly of the agricultural machinery gearbox of this utility model.

[0021] Figure 2 This is a front view of the transmission structure of the agricultural machinery gearbox of this utility model.

[0022] Figure 3 This is an isometric view of the transmission structure of the agricultural machinery gearbox of this utility model.

[0023] Figure 4 This is an isometric drawing of the shifting mechanism of this utility model.

[0024] Figure 5 This is a front view of the shifting mechanism of this utility model.

[0025] Figure 6 This is a partial cross-sectional view of the mounting shaft of this utility model.

[0026] Figure 7 This is an isometric schematic diagram of the variable speed bushing of this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Gearbox housing; 2. Mounting shaft; 3. Spline; 4. Gearbox bushing; 5. Shift assembly; 6. Mounting rod; 7. Shift arm; 8. Receiver groove; 9. Rod sleeve; 10. Sealing ring; 11. Oil seal; 12. Cover plate; 13. Bolt; 14. Washer; 15. Connecting plate; 16. Mounting post; 17. Anti-detachment limiter; 18. Mounting hole; 19. Limiting spring; 20. Limiting ball; 21. Annular groove; 22. Detailed Implementation

[0029] The preferred embodiments of this utility model will now be described in detail with reference to the accompanying drawings, so that the advantages and features of this utility model can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0030] like Figure 1-7 As shown:

[0031] A gear shifting structure for agricultural machinery includes a gearbox housing 1. A mounting shaft 2 is connected to the gearbox housing 1 via bearings. A gear shift sleeve 4 is fitted onto the mounting shaft 2. Specifically, a spline 3 is formed on the mounting shaft 2, and a keyway that mates with the spline 3 is machined on the inner side of the gear shift sleeve 4. In practice, a gear shifting assembly 5 is provided on the gearbox housing 1. The gear shifting assembly 5 is used to drive the gear shift sleeve 4 to slide along the mounting shaft 2, thereby enabling the gear on the gear shift sleeve 4 to achieve different transmission ratios with the shaft below, thus achieving the gear shifting effect.

[0032] Specifically, in this design, the mounting shaft 2 can serve as either an output or input shaft. When shifting gears, the gear set on the gear sleeve 4, mounted on it, engages with corresponding gears on other shafts via the shifting assembly, creating different transmission ratios and achieving gear shifting. During actual gear shifting, the rotation of the shifting arm 7 causes the shift wheel 8 at the other end of the mounting rod 6 to abut against any side wall of the gear sleeve 4, pushing the gear sleeve 4 to slide axially along the mounting shaft 2. When the shift wheel 8 contacts the gear sleeve 4, the rotation of the gear sleeve 4 drives the shift wheel to rotate, effectively reducing wear on the gear sleeve and shift wheel, and extending the service life of the shifting mechanism.

[0033] In specific implementation, an annular receiving groove 9 is provided on the outer surface of the gear shift sleeve 4, wherein the actuating wheel 8 is located in the annular receiving groove 9 and can move axially in the annular receiving groove 9. When the gear shift sleeve 4 is actuated by the actuating wheel 8, the actuating wheel 8 will abut against either side of the two side walls of the annular receiving groove 9 in the axial direction. The setting of the annular receiving groove 9 ensures that the gear shift sleeve 4 and the actuating wheel 8 have sufficient contact surface to ensure successful gear shifting. Specifically, the proximity of the actuating wheel 8 to the gear shift sleeve 4 can play a role in preventing the actuating wheel 8 from disengaging.

[0034] In specific implementation, a rod sleeve 10 is integrally formed, welded, or threaded onto the gearbox housing 1. The mounting rod 6 extends into the gearbox housing 1 through the rod sleeve 10 and can rotate within the rod sleeve 10. A sealing ring 11 is also provided between the mounting rod 6 and the rod sleeve 10, and an oil seal 12 is also provided at the end of the rod sleeve near the shift arm. The sealing ring 11 and the oil seal 12 prevent the lubricating oil inside the rod sleeve from flowing out, which would affect the smoothness of the rotation of the mounting rod 6 and reduce the wear between the mounting rod 6 and the rod sleeve 10.

[0035] In specific implementation, a cover plate 13 is provided at the connecting end of the shift arm 7. The cover plate 13 is installed at the end of the mounting rod located on the outside of the gearbox housing. The cover plate 13 is fixed to the end of the mounting rod 6 by bolts 14. A washer is also provided at the connection between the bolts 14 and the mounting rod 6. The cover plate 13 provides a good dustproof effect. On the other hand, by connecting the shift arm 7 through the cover plate 13, different shift arms 7 can be selected according to actual needs, which improves versatility.

[0036] In specific implementation, the mounting rod 6 is engaged with the connecting plate 16 at one end inside the gearbox housing 1. The free end of the connecting plate 16 is integrally formed with a mounting post 17. The actuating wheel 8 can be a bearing, which cooperates with the mounting post 17. The connection plate 16 and the mounting post 17 make the installation of the actuating wheel 8 simple and convenient. Specifically, to prevent the actuating wheel 8 from slipping off the mounting post 17, an anti-detachment limiting member 18 is detachably provided at the free end of the mounting post 17. The anti-detachment limiting member 18 can better prevent the actuating wheel 8 from sliding out along the axial direction of the mounting post 17. The anti-detachment limiting member 18 can be a limiting bolt, which is installed by threaded connection, which is simple, convenient and easy to operate.

[0037] In specific implementation, the mounting shaft 2 has a mounting hole 19 in the radial direction. Specifically, the mounting hole 19 can be a half-hole or a through hole; in this solution, it is a through hole. A limit spring 20 is installed in the mounting hole 19, and limit balls 21 are fixedly installed at both ends of the limit spring 20. When not in a limiting position, the side of the limit ball 21 away from the spring 20 protrudes from the outer surface of the mounting shaft 2. When the transmission sleeve 4 touches the limit ball 21, the limit ball 21 will exert pressure on the transmission sleeve 4, thereby limiting the transmission sleeve 4 and helping to maintain stable gear connection. To further stabilize the gear, two annular grooves 22 are provided on the inner surface along the axial direction of the transmission sleeve 4. These annular grooves 22 cooperate with the limit balls 21. Specifically, when the limit ball 21 is in the annular groove 22, it can effectively lock the transmission sleeve 4, thereby ensuring smooth operation in the predetermined gear.

[0038] In this scheme, during actual gear shifting, the shift arm 7 is rotated, causing the shift wheel 8 at the other end of the mounting rod 6 to rotate around the mounting rod 6. When the shift wheel 8 rotates around the mounting rod 6, it drives the gear sleeve 4 to move axially along the mounting shaft 2, thereby causing the gear on it to mesh with the gears on other shafts to achieve different transmission ratios and thus achieve gear shifting. When the gear sleeve 4 is in gear shifting position, the limit ball 21 will extend into the annular groove 22 to ensure the stability of the gear position.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims.

Claims

1. A gear shifting structure for an agricultural machinery gearbox, comprising a gearbox housing (1), wherein a mounting shaft (2) is rotatably connected within the gearbox housing (1), and a gear shift sleeve (4) is connected to the mounting shaft (2) via a spline (3), characterized in that: The gearbox housing (1) is provided with a shift assembly (5); the shift assembly (5) includes a mounting rod (6), which is rotatably connected to the gearbox housing (1); a shift arm (7) is provided at one end of the mounting rod (6) on the outside of the gearbox housing (1), and a shift wheel (8) is rotatably connected to the other end of the mounting rod (6), which is used to drive the gearbox sleeve (4) to move axially along the mounting shaft (2).

2. The agricultural machinery gearbox shifting structure according to claim 1, characterized in that: The outer surface of the gear shift sleeve (4) is provided with an annular receiving groove (9), and the actuating wheel (8) is located in the annular receiving groove (9). When the gear shift sleeve (4) is moved by the actuating wheel (8), the actuating wheel (8) abuts against either side of the two side walls of the annular receiving groove (9) in the axial direction.

3. The agricultural machinery gearbox shifting structure according to claim 1, characterized in that: A rod sleeve (10) is provided on the gearbox housing (1), and the mounting rod (6) is rotatably connected to the gearbox housing (1) through the rod sleeve (10); a sealing ring (11) is also provided between the mounting rod (6) and the rod sleeve (10), and an oil seal (12) is also provided at the end of the rod sleeve (10) near the shift arm (7).

4. The agricultural machinery gearbox shifting structure according to claim 1, characterized in that: The shift arm (7) also includes a cover plate (13), which is located at one end of the mounting rod (6) outside the gearbox housing (1), and the upper end of the cover plate (13) is provided with the shift arm (7).

5. The agricultural machinery gearbox shifting structure according to claim 4, characterized in that: The cover plate (13) is fixedly mounted on the end of the mounting rod (6) by bolts (14), and a washer (15) is also provided at the connection between the bolt (14) and the mounting rod (6).

6. The agricultural machinery gearbox shifting structure according to claim 1, characterized in that: The mounting rod (6) has a connecting plate (16) at one end inside the gearbox housing (1), and a mounting post (17) is provided at the free end of the connecting plate (16). The actuating wheel (8) is rotatably connected to the mounting post (17).

7. The agricultural machinery gearbox shifting structure according to claim 6, characterized in that: The free end of the mounting post (17) is detachably provided with an anti-detachment limiting member (18), which is used to prevent the actuating wheel (8) from falling off.

8. The agricultural machinery gearbox shifting structure according to claim 1, characterized in that: The mounting shaft (2) has a mounting hole (19) in the radial direction. A limit spring (20) is provided in the mounting hole (19). A limit ball (21) is fixedly provided on one side of the outer surface of the mounting shaft (2) of the limit spring (20). When not limited, the side of the limit ball (21) away from the spring (20) protrudes from the outer surface of the mounting shaft (2).

9. The agricultural machinery gearbox shifting structure according to claim 8, characterized in that: A plurality of annular grooves (22) are provided on the inner surface along the axial direction of the variable speed bushing (4). The annular grooves (22) cooperate with the limiting ball (21). The edges of the annular grooves (22) are provided with rounded corners or chamfered transitions.

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